Piston pin offset question.

[furious70]

So why are they done the way they are stock then, is there better longevity? Must be some other purpose than max power for oem design?

 

[Rapidtrans777]

Might as well get a 4/7 swap cam too.

@C Body Bob, you're changing cams anyway, pick up the free extra HP.

 

[furious70]

It'll double the cost of the cam though vs a cheap 509

 

[Big_John]

So why are they done the way they are stock then, is there better longevity? Must be some other purpose than max power for oem design?

Go to about 4:00 on this video.

 

[C Body Bob]

So why are they done the way they are stock then, is there better longevity? Must be some other purpose than max power for oem design?

Reduced wear on the cylinder wall. Better longevity. OEM engines are full of compromises.

 

[C Body Bob]

Go to about 4:00 on this video.

Yep that’s a great video of his

 

[furious70]

Why aren't performance pistons sold this way then, or have a never noticed?

 

[C Body Bob]

Why aren't performance pistons sold this way then, or have a never noticed?

Some are. Most are not concerned about longevity (100 thousand miles). The builder can request custom pistons too. Have the pin put anywhere he likes.

 

[furious70]

Ya I meant by default, would seem you'd want to advertise your pistons good for 10-15hp

 

[C Body Bob]

Ya I meant by default, would seem you'd want to advertise your pistons good for 10-15hp

Well they can’t because it only works on flat top pistons or dish. The person buying the performance pistons may have a different piston they are replacing.

 

[C Body Bob]

Ya I meant by default, would seem you'd want to advertise your pistons good for 10-15hp

Watch that video Big John shared. Uncle Tony explains it perfectly.

 

[C Body Bob]

Well as I was honing the cylinders it revealed this. I could see it & slight feel but a glaze over it didn’t reveal it that bad. After I honed & wiped down its pretty coarse. #4 hole. Looks like some water sat on top of the piston. Run it or have it bored ?

 

[C Body Bob]

#6

 

[413]

That’s far down From the top, not a problem At my house. This is a budget build right?

 

[C Body Bob]

That’s far down From the top, not a problem At my house. This is a budget build right?

Yes a budget

 

[70bigblockdodge]

Run it it's deep.

 

[C Body Bob]

Run it it's deep.

You think so. I should get a measurement on it to see just how far down it is

 

[70bigblockdodge]

You think so. I should get a measurement on it to see just how far down it is

That section on the right looks like a crack?

 

[65sporty]

As long as what Dave sees isn't a crack I would run it, budget build baby

 

[C Body Bob]

That section on the right looks like a crack?

I’ll double check but I think just a line of the corrosion.